As the scandal around spying and surveillance continues, Gideon Rachman is joined by James Blitz in the studio and Geoff Dyer down the line from Washington, to discuss the latest developments. Much of the focus in recent weeks has been on the activities of the US National Security Agency, but this week it was the turn of the British intelligence chiefs to give evidence in an open session of a Parliamentary committee, the first time that has ever happened. Did they say anything interesting? And are the intelligence agencies being held to account in the US?